Okay, so I've recently gained an interest in arduino shields. I find the add-ons quite attractive and useful. I stumbled upon a 64 button shield and even though the normal Rev3 has 13 i/o pins, you can have 64 buttons! Now, my question is; Can I make some sort of input extension? Are there other IC's for it? Is there code that allows you to have 2 specific pins be used for a button(for example, pin 6, 7, 8 could all be inputs while 9 10 and 11 outputs. If 6 --> 9, x happens, if 6 goes to...
Reverse of Shift Register?
Reverse of Shift Register?